Process for the excitation of a sample for NMR tomography
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United States of America Patent
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Sep 29, 1987
Grant Date -
N/A
app pub date -
Apr 16, 1985
filing date -
Apr 18, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The use of longer 180.degree. pulse sequences for the generation of spin echos is made possible according to the invention during NMR tomography using the 2d-Fourier transformation process in that the phase coding gradient between each pair of 180.degree. pulses is switched on in such a manner that the dephasing caused between each pair of 180.degree. pulses by the phase coding gradient is twice as great as the dephasing caused before the beginning of the first 180.degree. pulse by the phase coding gradient. The mirror images which appear otherwise when using the known 180.degree. pulse sequences, e.g. the Carr-Purcell-Gill-Meiboom pulse sequence, are avoided by this measure.
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